• A microcline specimen held in a hand for scale, larger than the hand. It is white with blocky angular crystals, and a sandy coating on some.
  • Twinned crystal growth of two large symmetric intersecting crystals on the side of the specimen.
  • Full view of the piece showing good composition of large and small microcline crystals partially coated with sandy-looking siderite.
  • Full view of the piece from a different angle looking whiter, with the siderite less visible.
  • Detail of well-formed microcline crystals along an edge of the mineral, with the rough back of the specimen visible.
  • Detail of the mineral deposition on the surface of the microcline, a grainy tan like sand only on some sides of the white crystals.
  • Detail of the mineral in the dark, exposed to UV light. The mineral fluoresces a light green color in small spots on the surface, which are mainly concentrated on the junctions between faces of the mineral.
  • Scale image of the piece on a measuring mat, a fanning wedge shape measuring almost five inches on one side and four on the other, and a bit over three inches wide.
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Microcline with siderite

Microcline with siderite

$55.00 USD
$55.00 USD
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Locale: Tatatila, Veracruz, Mexico

Approx dimensions: 4 x 3.25 x 2"

Approx weight: 705g (1.5 lb)

 

Microcline is a type of feldspar that forms sculptural blocky crystals. This piece has large, well-formed crystals displaying parallel growth and twinning, and a great composition for display. It is opaque and near-white with a pearlescent sheen. Fine brownish siderite has been deposited on one face of the crystals.

UV reactivity Under 365nm UV light, the microcline shows milky cream to red color with blue speckles throughout. An unknown mineral deposited along crystal junctions fluoresces bright green.

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